Ratatouille is based on the Pixar film of the same name. The version by Asobo Studio is, like other versions, a 3D platform game, but has its own design, levels and missions.
The game follows the plot of the film only loosely, with the main voice cast from the movie reprising their roles. The player controls Remy, a rat with a refined sense of taste. When Remy finds himself in Paris near the restaurant of the famous deceased chef Gusteau, he works on making his dream of becoming a chef himself come true, while helping out his fellow rats to procure food.
Gameplay involves jumping and double-jumping, swinging along poles, balancing on ropes, crawling on certain walls, and defending oneself with tail swipes or using spoons as weapons. Remy can also use his keen sense of smell to display the path to the next goal or objective. The game includes linear levels set in various locations around Paris, such as sewers, streets, rooftops, a restaurant kitchen, and a food market.
Mini-games are an integral part of the gameplay, often involving cooking with Remy having to pick ingredients or peel potatoes. Optional bonus missions take the form of dream sequences where Remy navigates landscapes made of foodstuffs. Collectibles are scattered throughout levels, with up to 100 stars to collect in most cases.
Collecting certain items awards bonus points, which can be spent in Gusteau's shop to unlock bonuses, including artwork and the option to play mini-games outside the main game in both single and multiplayer modes.